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Frenum piercing
A frenum piercing is a male genital piercing placed through the loose surface tissue on the underside of the penis shaft, second in popularity only to the Prince Albert.
Frequency spinal cord stimulation
Frequency spinal cord stimulation (SCS) is a neuromodulation therapy that delivers tonic electrical pulses to the spinal cord to relieve chronic, intractable pain of the trunk and limbs.
Frequent episodic tension-type headache
Frequent episodic tension-type headache (ICHD-3 2.2) is a primary headache with bilateral, pressing, mild-to-moderate attacks on 1-14 days/month for >3 months; treated with simple analgesics and, if disabling, preventives such as amitriptyline.
Frequent menstrual bleeding
Frequent menstrual bleeding (frequent menses, ICD-11 GA20.10) is a FIGO-defined abnormal uterine bleeding symptom: cycles shorter than 24 days, more than four episodes in 90 days, usually from ovulatory dysfunction.
Frequent micturition
Frequent micturition (urinary frequency, ICD-11 MF50.0) is urinating many times day or night in normal or small volumes, unlike polyuria (>3 L/day); common causes include UTI, BPH, incontinence, calculi, and overactive bladder.
Fresh frozen plasma
Fresh frozen plasma (FFP) is plasma frozen at −25°C or colder within 6–8 hours of separation, used to replace coagulation factors in bleeding, massive hemorrhage, and factor deficiencies; dose 10–20 ml/kg, thawed use within 24 hours.
Freshman 15
Freshman 15: the popular belief that first-year college students gain 15 pounds (6.8 kg). Research, including a 2015 meta-analysis, finds an average gain of about 1.36 kg (3 lbs), with only 9.3% gaining 15 pounds.
Freshwater aquarium snail care
Freshwater aquarium snail care is the husbandry of ornamental snails such as mystery, nerite, rabbit, and Malaysian trumpet snails, centered on hard water for shells and avoiding copper.
Freshwater crustacean fauna of Africa
The freshwater crustacean fauna of Africa centers on about 120 freshwater crab species, all endemic, with Lake Tanganyika holding the world's only endemic crab flock.
Freshwater crustacean fauna of Asia
The freshwater crustacean fauna of Asia is dominated by freshwater crabs of Potamidae and Gecarcinucidae and caridean shrimps, centered on tropical Asia, the world's richest region.
Freshwater crustacean fauna of Australia
The freshwater crustacean fauna of Australia comprises inland-water malacostracans and branchiopods, notable for very high endemicity and the world's most endangered freshwater crayfish fauna, assessed in 2010.
Freshwater crustacean fauna of North America
The freshwater crustacean fauna of North America comprises copepods, ostracods, branchiopods, and malacostracans, with malacostracans dominated by crayfishes, amphipods, and isopods, including many blind cave species.
Freshwater drum
Freshwater drum (Aplodinotus grunniens) is a North American freshwater fish of the drum family Sciaenidae, ranging from Hudson Bay to Guatemala and known as sheepshead or gaspergou.
Freshwater ecosystem
A freshwater ecosystem is a community of organisms and their environment in low-salt water like rivers, lakes, and wetlands, covering under 1% of Earth's surface yet holding one third of vertebrate species.
Freshwater fish
Freshwater fish: fish living in rivers, lakes, and wetlands; 42.7% of all fish species occur only in freshwater. Key facts: 25% threatened with extinction (IUCN), migratory populations down 81% since 1970, inland fisheries worth about USD 19 billion.
Freshwater gastropods of Eurasia
Freshwater gastropods of Eurasia are the snail faunas of Europe and Asia's rivers, lakes, springs, and groundwaters, with roughly 1,500 West Palearctic species shaped by karst endemism and post-glacial recolonisation.
Freshwater gastropods of North America
The freshwater gastropods of North America are the snails living in rivers, lakes, springs, and groundwaters of Canada, the United States, and northern Mexico, with about 64% imperiled.
Freshwater lichens by region
Freshwater lichens are lichen-forming fungi found in and along watercourses, with about 200 species known worldwide, most unable to survive constant immersion and knowledge biased toward temperate regions.
Freshwater mussel conservation
Freshwater mussel conservation is the applied biology of protecting unionoid mussels, whose larvae parasitize fish and whose populations are declining, through habitat restoration, hatchery propagation, and legal protection.
Freshwater pearl mussel
Freshwater pearl mussel (Margaritifera margaritifera; eastern pearlshell): a Holarctic, long-lived salmonid-parasite bivalve of nutrient-poor rivers, Critically Endangered in Europe, over 90% declined, juveniles buried 5 years.
Freshwater prawn farming
Freshwater prawn farming: aquaculture of Macrobrachium prawns, chiefly giant river prawn M. rosenbergii, in ponds and rice fields; 450,158 t farmed in 2010, hatchery-nursery-grow-out phases, lower impacts than marine shrimp.
Freshwater snail
Freshwater snails are gastropod molluscs of inland waters, descended from at least 32 independent marine colonizations, intermediate hosts of schistosomiasis parasites, grazers of algae, and a group including 95 documented invasive species.
Freshwater sponge ecology
Freshwater sponge ecology covers how sponges live attached to hard surfaces in lakes and streams, filtering water, signaling high water quality, and hosting algae, insects, and predators.
Frey syndrome
Frey syndrome (auriculotemporal syndrome, gustatory hyperhidrosis): gustatory sweating and flushing from aberrant parasympathetic regeneration after auriculotemporal nerve injury, usually parotidectomy; described by Lucja Frey, 1923.
Freya (cat)
Freya (cat): a common cat name from Freyja, the Norse goddess who rode a cat-drawn chariot. Notable bearers include the 2019 Cats Protection "miracle kitten" and George Osborne's cat Freya.
Freyellidae
Freyellidae, also called freyellid sea stars, is a family of deep-sea Brisingida asteroids named by Downey in 1986; monophyletic, about 47 species in 7 genera including Freyella, suspension-feeding at greater depths than other brisingids.
Friction blister
Friction blister (ICD-11 EH92.1), an intraepidermal blister from repetitive shear deformation, typically in the stratum spinosum of palms, soles, and toes; treated by drainage and dressings, prevented by socks, insoles, and tape.
Fridericia
Fridericia Mart. (Bignoniaceae, tribe Bignonieae) is a genus of about 62 neotropical liana species from Mexico to tropical America, formerly including most of Arrabidaea; best known for the medicinal, dye plant Fridericia chica.
Fried rice (炒饭)
Fried rice (炒饭, chao fan) is a Chinese-origin stir-fried rice dish dating to the Sui dynasty, best known as Yangzhou fried rice, with regional versions like nasi goreng, khao pad, and chahan, cooked with day-old rice for wok hei flavor.
Fried spider
Fried spider, or a-ping (អាពីង), is a Cambodian delicacy of deep-fried tarantulas sold chiefly in Skuon, Kampong Cham; associated with Khmer Rouge famine eating, garlic-salt frying, and a declining wild harvest.